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Reports instantiations of <code>java.util.Map</code> objects
whose key types are enumerated classes. Such <code>java.util.Map</code> objects
can be replaced with <code>java.util.EnumMap</code> objects.
<p>
  <code>java.util.EnumMap</code> implementations can be much more efficient
  because the underlying data structure is a simple array.
</p>
<p><b>Example:</b></p>
<pre><code>
  Map&lt;MyEnum, String&gt; myEnums = new HashMap&lt;&gt;();
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  Map&lt;MyEnum, String&gt; myEnums = new EnumMap&lt;&gt;(MyEnum.class);
</code></pre>
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